hwdef: CarbonixCommon: disable intentional WDT

The existence of this feature freaks people out.

libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/features.inc

@@ -304,7 +304,6 @@ undef AP_MOTORS_FRAME_Y6_ENABLED
 undef AP_SMARTAUDIO_ENABLED
 undef AP_TRAMP_ENABLED
 undef AP_VIDEOTX_ENABLED
-undef AP_ICENGINE_TCA9554_STARTER_ENABLED
 
 define HAL_EXTERNAL_AHRS_ENABLED 1
 define AP_EXTERNAL_AHRS_MICROSTRAIN5_ENABLED 0
@@ -612,4 +611,8 @@ define AP_MOTORS_FRAME_Y6_ENABLED 0
 define AP_SMARTAUDIO_ENABLED 0
 define AP_TRAMP_ENABLED 0
 define AP_VIDEOTX_ENABLED 0
+
+# Additional features manually added
+# (not found in build_options.py, so not settable on custom build server)
 define AP_ICENGINE_TCA9554_STARTER_ENABLED 1
+define AP_MAVLINK_FAILURE_CREATION_ENABLED 0